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BILD3

Lecture 4

TermDefinition
Genotype genetic composition of an organism (single gene or whole genome)
Phenotype the characteristic appearance or function of an organism resulting from genotype and/or environment
Discrete Trait a phenotype that manifests as clear and separable differences in a population.
Continuous Trait a phenotype that manifests as a continuum along a spectrum
Obligate Trait a phenotype that is 100% dependent on the genotype of the individual, not the environment
Facultative Trait the phenotype correlates strongly with the environment
Reaction Norm the range of phenotypes that appear for a single genotype under different environmental conditions
Phenotypic Plasticity the ability of an organism to change its phenotype because of environmental conditions
Polyphenism the phenomenon where two or more distinct phenotypes are produced by the same genotype
Mutation Change in genetic material of an organism; he only source of NEW genetic variation; Change has to be heritable to alter the population (in the sperm and eggs)
Recombination “reshuffles the deck,” creates new genetic combinations
Population variation any difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences
Heritability proportion of phenotypic variation that is genetic
Adaptation process by which an animal or plant species becomes fitted to its environment; it is the result of natural selection's acting upon heritable variation
Created by: stacymdez